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A maintenance controller reports four flight displays (F/ds) had red lights illuminated in-flight on a crj-900 aircraft. Number one display cooling fan had been previously replaced to clear an MEL; but later found incorrectly installed with fan air flowing in the wrong direction. Flight crew diverted.
| Attributes | |
| ACN | 961275 |
| Time | |
| Date | 201107 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Cooling Fan any cooling fan |
| Person 1 | |
| Function | Other / Unknown |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
During outstation maintenance troubleshooting of the reason for this problem; it was noted that the # 1 primary flight displays (pfd) display cooling fan/check valve was installed backwards; causing air to flow the opposite direction from the intake filter when the fan was turned on. Fan was [originally] changed to clear an MEL two days earlier. Outstation mechanic removed fan and reinstalled in the proper orientation. [Have] no suggestions other than the obvious - take care when changing a part. Four primary flight displays (pfds) had red lights on; diverted into ZZZ1.
Original NASA ASRS Text
Title: A Maintenance Controller reports four Flight Displays (F/Ds) had red lights illuminated in-flight on a CRJ-900 aircraft. Number One Display Cooling Fan had been previously replaced to clear an MEL; but later found incorrectly installed with fan air flowing in the wrong direction. Flight crew diverted.
Narrative: During Outstation Maintenance troubleshooting of the reason for this problem; it was noted that the # 1 Primary Flight Displays (PFD) Display Cooling Fan/Check valve was installed backwards; causing air to flow the opposite direction from the intake filter when the fan was turned on. Fan was [originally] changed to clear an MEL two days earlier. Outstation Mechanic removed fan and reinstalled in the proper orientation. [Have] no suggestions other than the obvious - take care when changing a part. Four Primary Flight Displays (PFDs) had red lights on; diverted into ZZZ1.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.